I am the author of the book Possibility Thinking: Explorations In Logic and Thought. The file to download and read in any text editor is "words" as linked below as is and is licensed as Public Domain on http://www.archive.org/details/JustinCoslor/. It is in paperback format at http://lulu.com/justincoslor/ ISBN: 978-0-6152-4265-1
The diagram scans are available at
and that address is printed on the back cover.